TWD Captital Improvement Plan - 05.08.1991 EE
CAPITAL IMPROVEMENTS PLAN
Funded from System Development Charges
5-Year Plan
May 8, 1991
Fiscal Year 1991-92
Estimated
Proiect Cost
Alternative A
Al. Pipeline Extension: S.W. MacDonald Street
Hall Blvd. to Pacific Highway, 5,100 feet of
24" D.I. pipe @ $72/ft $367,200
.4410,
Justification: This is the last phase of the instal-
lation of a 24-inch transmission main, paralleling a
16-inch main, (or 30-inch equivalent) from Lake
Oswego's Waluga Reservoir to the 10-MG (terminal)
reservoir located on SW 125th and Bull Mountain Road.
This provides the district with its primary source of
water supply, the Clackamas River via the City of
Lake Oswego. The City of Tigard plans to widen
McDonald this year and this pipeline should be
installed prior to the widening.
A2. Future Reservoir Site: Purchase 2 acres of land near
Mtn. Gate subdivision on Bull Mountain for future
2.5-MG reservoir at elevation 550 feet above sea level 100,000
Justification: An engineering study of 1986 advised
that sites for four (4) new reservoirs should be purchased
before the land was taken up for houses. This is the last
of the four sites to be purchased upon which a 2.5-MG reservoir
project will begin FY 95/96.
`"I 1
New ([
A3. Reserve for construction of future 2.5-MG reservoir to be
located at S.W. 141st Avenue, between Beef Bend Road and
Bull Mountain Road 36,000
Justification: The district has adopted a policy of
paying for needed capital improvements from current
revenue. Engineering studies of 1986 and 1990 advised that
to keep up with growth, the district must construct a 2.5-MG
reservoir near SW 141st on Bull Mountain. This will provide
the district with a total of 23.5 million gallons of storage.
The reservoir will serve all residents below elevation
350 feet above sea level on the south side of Bull Mountain.
The expenditure is too large to accrue in one or two years
and this is just the start in savings for that reservoir
construction.
Total, Alternative A X503.200
Capital Improvements Plan, continued 2
Fiscal Year 1991-92
Estimated
Project Cost
Alternative B
B1. Pipeline Extension: S.W. 121st and Walnut Street,
from Fonner to 135th Avenue, 5,600 feet of
24" D.I. pipe @ $72/ft $403,200
Justification: In the summer time, No. 3 reservoir will
not fill because the pipelines serving it are too small.
With high growth in this area, along with the requirement
that water be pumped from the 132nd Street pump station to
High Tor, it is deemed important that this main be installed
as soon as possible. Additionally, fire flows are deficient
in some parts of the area. The engineering study of 1986
recommended that this main be constructed. If the City defers
the MacDonald street project, then this pipeline would be built.
B2. Future Reservoir Site: Purchase 2 acres of land near
Mtn. Gate subdivision on Bull Mountain for future
2.5-MG reservoir at elevation 550 feet above sea level 100,000
Justification: An engineering study of 1986 advised
that sites for four (4) new reservoirs should be purchased
before the land was taken up for houses. This is the last
of the four sites to be purchased upon which a 2.5-MG reservoir
project will begin FY 95/96.
Total, Alternative B 1503 200
Capital Improvements Plan, continued 3
err
E,
Fiscal Year 1992-93
Estimated
Proiect Cost
Alternative A
Al. Pipeline Extension: S.W. 121st and Walnut Street,
from Former to 135th Avenue, 5,600 feet of
24" D.I. pipe @ $72/ft $403,200
Justification: See Project B1 for FY 91/92. If this
project is not built in FY 91/92, then it should be
built in FY 92/93.
A2. Telemetry System: New telemetry system to monitor and
record data about all pump stations and reservoirs 150,000
Justification: With the huge growth in the Tigard area
it is now impossible to monitor the water system without
an updated telemetry system. This system was recommended
in the engineering study of 1971. It allows one person to
monitor the water system at a glance. Problem areas can be
identified immediately and resolved without long lag times.
Major leaks and main breaks can be identified and located
within minutes, instead of hours.
Total, Alternative A $553.200
Estimated
Proiect Cost
Alternative B
Bi. Pipeline Extension: S.W. MacDonald Street,
Hall Blvd. to Pacific Highway, 5,100 feet of
24" D.I. pipe @ $72/ft. $367,200
Justification: See Project Al for FY 91/92. If the
City of Tigard defers widening until FY 92/93, then
this project should be built in FY 92/93.
Capital Improvements Plan, continued 4
•
(F,
B2. Telemetry System: New telemetry system to monitor and
record data about all pump stations and reservoirs 150,000
Justification: See Project A2 for this FY.
B3. Reserve for construction of future 2.5 MG reservoir 36,000
Justification: See Project A3 for FY 91/92
Total, Alternative B $553,200
Estimated
Proiect Cost
Alternative C
Cl. Pipeline Extension: S.W. Greenburg Road,
Highway #217 to Bradley Corner,
4,000 feet of 24" D.I. pipe @ $72/ft ($288,000),
including a 36" bore under Highway #217 ($72,000) $360,000
Nifty
Justification: In the years ahead, the district will
have to import more and more Bull Run water from Portland
because Lake Oswego has limited capacity to serve both its
own citizens and TWD. This 24-inch main will parallel an
existing 16-inch main and will allow higher flow rates
to be purchased from Portland to meet the demands of the
district well beyond year 2000. An equivalent 30-inch main
(16-inch plus 24-inch) was recommended in the engineering
study of 1971. This line would be built in FY 92/93 if the
City of Tigard cancels MacDonald street widening or if there
is a material decrease in the supply for Lake Oswego.
C2. Telemetry System: New telemetry system to monitor and record
data about all pump stations and reservoirs 150,000
Justification: See Project A2 for FY 92/93
C3. Reserve for Construction of Future 2.5 MG Reservoir 43,200
Justification: See Project A3 for FY 91/92
Total, Alternative C $553200
Capital Improvements Plan, continued 5
Fiscal year 1993-94 (E,
Estimated
Proiect Cost
Alternative A
Al. Pipeline Extension: S.W. Greenburg Road,
Highway #217 to Bradley Corner,
4,000 feet of 24" D.I. pipe @ $72/ft ($288,000),
including a 36" bore under Highway #217 ($72,000) $360,000
Justification: In the years ahead, the district will
have to import more and more Bull Run water from
Portland because Lake Oswego has limited capacity to
serve both its own citizens and TWD. This 24-inch
main will parallel an existing 16-inch main and will
allow higher flow rates to be purchased from Portland
to meet the demands of the district well beyond year 2000.
An equivalent 30-inch main (16-inch plus 24-inch) was
recommended in the engineering study of 1971. If this line
is not built in FY 92/93, then it should be built in FY 93/94.
Nos A2. Reserve for Construction of Future 2.5 MG Reservoir 200,000
Justification: See Project A3 for FY 91/92.
Total, Alternative A 060.000
N""" Capital Improvements Plan, continued 6
Fiscal Year 1993-94 (E,
Estimated
Proiect Cost
Alternative B
B1. Pipeline Extension: S.W. Greenburg Road,
Highway #217 to Bradley Corner,
4,000 feet of 24" D.I. pipe @ $72/ft ($288,000),
including a 36" bore under Highway #217 ($72,000) $360,000
Justification: See Project Al for FY 93/94
B2. Pipeline Extension: S.W. 115th Avenue, Walnut Street to
North Dakota Street, 3,580 feet of 12" D.I. pipe @ $43/ft 154,000
Justification: This portion of the distribution system lacks
a large main through it. Eventually this line would connect
to a future 12" line on North Dakota, which would be an extension
of an existing 12" line at S.W. 108th and North Dakota. The
engineering study of 1990 recommended these lines.
,,w, B3. Reserve for Construction of Future 2.5 MG Reservoir 46,000
See Project A3 for FY 91/92.
Total, Alternative B $560,000
Capital Improvements Plan, continued 7
Fiscal year 1994-95 (E)
Estimated
Proiect Cost
Alternative A
Al. Pipeline Extension: S.W. North Dakota Street, from
108th to 121st Avenue, 3,070 feet of 12" D.I. pipe
@ $43/ft $132,000
Justification: This portion of the distribution system
lacks a large main through it. This pipeline will connect
to the line proposed for S.W. 115th, Project Bi, FY 93/94
The engineering study of 1990 recommended these lines.
A2. Reserve for Construction of Future 2.5-MG Reservoir
Justification: See Project A3 for FY 91/92 418,000
Total, Alternative A $550000
Alternative B
�.- Estimated
Proiect Cost
Bl. Reserve for Construction of Future 2.5-MG Reservoir $
550,,000
Justification: See Project A3 for FY 91/92
�""" Capital Improvements Plan, continued 8
r
t�r:
Fiscal year 1995-96 (E
Estimated
Proiect Cost
Alternative A
Al. Reserve for Construction of Future 2.5-MG Reservoir $550,000
Justification: See Project A3 for FY 91/92
Alternative B
Bl. Reserve for Construction of Future 2.5-MG Reservoir $418,000
B2. Pipeline Extension: S.W. North Dakota from 108th to
121st Avenue, 3,070 feet of 12" D.I. pipe @ $43/ft 132,000
Justification: See Project Al for FY 94/95
Total, Alternative B $550,000
Note on Accumulated Reserve for Future Reservoir
At end of FY 95/96, the least amount accumulated is estimated to be
$882,000 and the greatest amount is $1,379,200. Accrued interest,if any,
is not included.
The reservoir is estimated to cost $1,300,000 at the present time. This
does not include an allowance for inflation.
It thus appears that construction could begin as early as the second half
of FY 95/96.
Capital Improvements Plan, continued 9